Power lift



March 14, 1944. BROWN ETAL 2,344,123

POWER LIFT Filed June 26, 1941 s'isheets-sheet 1 March 14, BRQWN ET AL2,344,123

POWER LIFT Filed June 26, 1941 3 Sheets-Sheet 2 FIG. 3

March 14, 1944.

T. BROWN ET AL POWER LIFT s Sheets-Sheet 5 Filed June 26, 1941 FIG. 7

. INVENTOR THEOPHILUS BROWN Patented Mar. 14, 1944 POWER LIFT Frank '1.Court, Moline,

Thcophilus Brown and Ill., assignors to Deere a corporation of Illino ifCompany, Molina, 111.,

Application June 26, 1941, Serial No. 399,852 Claims. (01. 97-50) otherfeature of this invention to provide means The present invention relatesgenerally to agricultural implements and more particularly to implementsof the towed type,.i. e. those adapted to be pulled and/or operated by afarm tractor.

The object and general nature of the present invention is the provisionof new and improved lifting means whereby the depth of operation of thetool or tools of a towed implement may be controlled by power derivedfrom the tractor. More specifically, it is a feature of this inventionto provide means whereby a hydraulically operated unit on the tractor isconnected to raise and lower the implement tool or tools through theagency of a generally longitudinally extending torque shaft which is soconstructed and arranged as to eflectively control the tool means butnot interfere with the relatively wide lateral swinging of the implementrelative to the tractor, when making a turn with the tool or tools inraised position. Particularly, it is a feature of this invention toprovide a torque shaft lifting mechanism connected through a universalJoint with an operating member on the tractor, with the parts soconstructed and arranged that when the implement is in its raisedposition, one axis of the universal Joint is disposed generallyvertically and generally in coincidence with the vertical axis aboutwhich the implement pivots relative to the tractor, whereby when thetool or tools are raised, the hitch connection and the torque shaftpivot laterally about a common axis, thereby facilitating the making ofshort turns. as at the headlands.

Another important feature of this invention is the provision of a torqueshaft, operatively connecting a power unit on the tractor with theraising mechanism of the implement, which includes detachable sections,and where th implement itself is connected with the tractor by overloadrelease means, whereby when the latter operates to release theimplement, the power connection between the power unit on the tractorand the implement raising mechanism is also automatically released.Further, in this connection, it is an additional feature of the presentinvention to provide a power actuated unit on the tractor operablethrough a range which is not only sufficient to raise and lower thetools but also is sufllclent to be moved an additional amount, more thanany deflection that may take place in the torque shaft, so that theimplement may readily be reconnected with the-tractor and the powerlifting connections readily reconnected by simply inserting onesectional torque shaft portion in the cooperating portion. Stillfurther, it is anfor limiting the lowered pcnition of the tool means orassociated parts so that, upon the release of theoverload mechanism andthe consequent disconnection of the lifting connections, the tool ortools will not be permitted to move into any abnormal position in whicha reconnection might be inconvenient or diflicult. Another feature ofthis their raised position.

invention is the provision of controllable means eifective to latch thetool or tools in their raised position so as to provide for transportingthe implement from one place to the other and at the same time relievthe torque shaft connection from the burden of holding the tool or toolsin It is also a feature of this invention to provide latch means forholding the tool or tools raised when the implement is disconnected fromthe tractor and the power unit thereon that normally controls theposition of the tools in operation.

These and other objects and advantages of the present invention will beapparent to those skilled in the art after a consideration of thefollowing detailed description, taken in conjunction with theaccompanying drawings in which the preferred form of the invention hasbeen illustrated.

In the drawings:

Figure 1 is a plan view of a tractor-propelled implement in which theprinciples of the present invention have been incorporated;

Figure 2 is a side view of the machine shown in Figure 1;

Figure 3 is a view taken generally along the line 3-3 of Figure 1 andlooking forwardly toward the rear end of the tractor;

Figure 4 is a sectional view, on an enlarged scale, taken along the line4-4 of Figure 1 and showing the stop means and latch means associatedwith the ground wheel crank axles, the parts being shown in thepositions they occupy when the implement is in operating position;

Figure 5 is a view similar to Figure 4, showing the parts in thepositions they occupy when the implement is in its raised or transportposition;

Figure 6 is a fragmentary plan view of a tractor-propelled implement inwhich a modified form of the present invention has been incor porated;and

Figure 7 shows the relations between the power take-01f shaft and thepower lifting shaft when the implement is turned either to the right orleft relative to the tractor.

Referring now to the drawings, more particu larly to Figures 1 and 2,the present invention is shown as incorporated in an agriculturalmachine comprising a tractor I, an implement, such as a plow 2, andsuitable power operated connecting mechanism, indicated in its entiretyby the reference numeral 3, extending between a power unit, indicated bythe reference numeral 4, and tool raising and lowering mechanism,indicated in its entirety by the reference numeral 5.

The tractor I is largely conventional, including rear traction wheels Isecured to axle shafts journaled for rotation in a rear axle structureI2, the latter also carrying a drawbar I3 to which implements and otherloads may be connected. Generally, as will be explained in detail below,the implements or other loads connected with the drawbar I3 are arrangedto swing generally laterally. The tractor I preferably is equipped witha power unit 4 of the hydraulic type, embodying a cylinder and ram unit,indicated by the reference numeral I5 controlled by valve mechanism I 5and adapted to swing a rock shaft I! on the tractor and to hold the rockshaft IT in different positions of adjustment. The power unit 4 may beof any suitable construction, and our present invention is notparticularly concemed with the details per se of the power unit.

Generally, such a unit includes a source of fluid pressure driven by thetractor motor and operative to control the cylinder and ram unit in anysuitable way. Preferably, however, the control means I6 is similar tothat shown in the United States Patent No. 2,286,256, issued June 16,1942, to Theophilus Brown, to which reference may be had if necessary.The rock shaft I1 is supported for rocking movement on the tractor bybrackets I9, and the rock shaft I'I' carries an arm I9 connected by alink 2I to the cylinder and ram unit I5.

The implement 2 preferably is in the form of a plow embodying framemeans 24 in the form of a pair of tool beams 25 suitably braced andconnected together and formed at their rear ends to receive a pair ofplow bottoms or furrow openers 26. The implement frame 25 is supported,at least in part, by a pair of ground wheels 3I and 32 mounted,respectively, on a pair of crank axles 33 and 34, said crank axleshaving intermediate sections and 36 which are connected by brackets 31to the frame beams so as to accommodate rocking movement of the crankaxles. The wheel 3| is a land wheel and the wheel 32 is a furrow wheeloperating normally in the last furrow opened on the previous round. Inorder that the two wheel carrying crank axles 33 and 34 may be rocked inunison, an arm M is fixed to the intermediate portion 35 of the crankaxle 33 and a second arm 42 is fixed to the intermediate portion 36 ofthe crank axle 34. A link 44 is connected with the arm 4| by a pin 45and extends forwardly to an arm 46 fixed for pivotal movement with theimplement frame 25, and the link 44 is extended, as at 41, to form asector with which a hand lever 48 cooperates. The hand lever is pivotedat 49 on the link 44 and has an arm 5I pivoted to a link 52, the rearend of which is pivotally connected to the other crank axle arm 42. Bythis means when the hand lever 48 is locked to the sector 41, both crankaxles are rocked in unison, and by disconnecting the hand lever 48 fromthe sector 41 and rocking the hand lever, the furrow wheel crank axle 34may be rocked relative to the land wheel crank axle 33 for leveling theplow.

Plates G0 are fixed to the front ends of the beams 25 and receive clevismembers BI to which a transverse hitch bar 62 is connected. The hitchbar 62 forms a part of a hitch indicated in its entirety by thereference numeral 65 which is constructed along the lines of the hitchshown the arm IOI.

connected by a similar universal joint I04 to the in the prior Patent1,901,134, issued March 14, 1933, to C. G. Strandlund, to whichreference may be had if desired. Briefly, the hitch 65 includesforwardly converging hitch bars 51 and 68, the hitch bar 61 comprising apair of straps spaced apart at their forward ends to receive acushioning spring 69 therebetween. The spring 69 forms a part of anoverload release indicated in its entirety by the reference numeral IIand which is similar to that shown in the prior Patent 1,919,915, issuedJuly 25, 1933, to C. G. Strandlund. The overload release II includes aslidable member 13 whose sliding movement is resisted by the spring 69.A hook or arm 14 is pivoted at I5 to the forward end of the slidablemember I3 and receives a clevis 11 that is pivoted to the rear end ofthe tractor drawbar I3 by a pivot bolt I8. The arm I4 has its rear andengaged in a slide 19 whose position along the upper member of the hitchbar 61 may be adjusted. If the implement should strik an obstruction orbe subjected to an overload, the cushion spring 69 is compressed,

permitting the member I3 and the arm 14 to slide forwardly until therear end of the arm 14 is freed from the slide 19, whereupon the arm 14swings forwardly and is disengaged from the tractor clevis TI.

A rod 95 is pivoted at its forward end to a bracket 86 fixed to thehitch bar 61, and the rear end of the rod is slidably disposed in asleeve 81 pivoted to the upper end of an arm or bracket 88 rigidlyconnected with the beams 25. A coiled spring 89 operates between thesleeve 81 and a collar 9I longitudinally adjustable on the rod 85 andsecured to any point of adjustment by a set screw or the like. Thespring 89 is adjusted so as to counterbalance the component of the forceof the draft tending to cause the frame 24 to swing downwardly. Thispermits raising the hitch point between the hitch 65 and the implementframe a considerable distance above the line of draft extending from thetractor drawbar rearwardly and downwardly to the center of resistancebetween the two furrow openers 26.

The operating connections between the power unit 4 on the tractor andthe implement will now be described.

An arm IOI is connected, as by welding or the like, to the tractor rockshaft I1, and at its outer end carries universal joint means I02 bywhich the upper end of a link I03 is connected with The lower end of thelink I03 is outer end of an arm I05 which is connected, as by welding orthe like, to a longitudinally disposed shaft I06. The latter is mountedfor rocking movement in a bearing I01 suitably carried by a bracket I08which is fixedly secured to the drawbar or some other part at the rearof the tractor. The rear end of the longitudinal shaft I 06 is connectedby a universal joint III to a pair of telescopically associated shaftsections I I 2 and I I3, the rear end of the latter being connected by auniversal joint II4 to a shaft II5 carried on the implement by a pair ofbrackets I I1 and I I8. Secured to the rear end of the shaft H5 is anarm I2I that is connected by universal joint means I22 to the upper endof a link I23, and the lower end of the latter is connected by universaljoint means I24 to a bracket I25 carried on or fixed to the land wheelcrank axle 33. The

shaft section H isfdisposed generally longitudinally, like the forwardshaft section IN. and the telescopic shaft sections H2 and H3 connectingthe shaft sections I06 and H! are disposed generally above the hitch 65.The joint HI is disposed substantiatlly directly above the pivot pin 18connecting the front end of the hitch I to the tractor drawbar l3.

The operation of the structure so far described is substantially asfollows:

When the furrow openers are in their operating position, the crank axles33 and 34 are more or less approximately horizontal and the arm I2! onthe implement is in its upper position. The flexibility afforded by theuniversal joints HI and H4 accommodates both lateral and generallyvertical swinging of the implement relative to the tractor as the outfittraverses uneven ground, passes over the tops of hills or rises andacross gullies or low places. The rear universal joint H4 is adjacentthe pivot connection between the hitch 65 and the front ends of the plowbeams so that any flexing as between the hitch and the implement isaccommodated by the universal Joint H4 acting in conjunction with thetelescoping shaft sections I|2 and H3.

When the operator desires to raise the tools out of the ground, heactuates the valve controlling mechanism l6 so as to rock the shaft I!in a counterclockwise direction (Figure 2). This swings the outer end ofthe arm llll upwardly and exerts a pull through the link I03 and swingsthe interconnected shaft sections I08, III, III, and H5 about agenerally longitudinally extending axis generally in a counterclockwisedirection (Figure 3). This causes the arm l2| to exert a downward thrustthrough the link I23 against the crank axle 33, and the reaction of thiscounter-clockwise movement exerts a lifting force through the bracketsH8 and H1 against the the pivot 18, extends in a vertical position withits axis substantially coinciding with the axis of the pivot pin 18(Figure 3). Thus, when the implement is in its raised position, it isfree to swing laterally in either direction about its point of pivotconnection with the stantially unlimited freedom. ing sharp turns withthe outfi lands or in other cramped When in operating positions (Figures1 and 2), the various shaft sections, which constitute a lifting torqueshaft, are disposed generally in longitudinal alignment so thatvariations in the lateral position of the implement relative to thetractor, as may occur during operation, have substantially no effect onthe position of the tools. When plowing, the universal joint axis may ormay not be vertical (see Figures 1 and 2), depending on the depthadjustment, but this is of no concern since in normal operation thetractor turns very little relative to the plow.

The hydraulic unit 4, with its controlling valve mechanism I6, is soconstructed and arranged that the tools may be moved into variouspositions of adjustment, as desired, by proper operation of the valvemechanism Hi.

It will thus be seen that we have provided a This permits makt, as atthe heador close quarters.

simple and sturdy mechanism by which the position of a tool or tools ona trailing implement may be easily and conveniently controlled from apower unit on the tractor. If the implement should strike anobstruction, causing the overload release to trip and freeing theimplement from the tractor, a continued forward motion of the lattermerely causes the front telescopic shaft section I I2 to slideout of therear telescopic shaft section H3, which stays with the implement. Thus,the power actuated lifting connections extending from the tractor to theimplement are so constructed and arranged as to accommodate the releaseof the implement from the tractor whenever it is necessary or desirablethat it should occur. The power unit and the arms and links asciatedtherewith are so arranged that they have a range of movement somewhatgreater than the corresponding range of movement of the liftingmechanism on the implement, specifically the arm I21. Thus, inreconnecting the lifting mechanism on the implement.

In order to control the downward movement of the implement frame 25 andtools 28 when an arm I 3! fixed to the intermediate section 35 of ,thecrank axle 33, preferably by welding or the like, and the arm isarranged so that in ore particularly to Figure 4, I35 is pivoted, as atE36, to the 5 and is provided with a notch a latch member adjacent beam2 I51 that is adapted to engage the inner extended end of the pin 45connecting the upper portion of an arm H to the rear end of the link 44.A spring I is anchored at its forward or upper end to the pivot I55between the arm 5i and the link 52 and at its rear or lower end carriesa hook I45 which is detachably engageable with the arm I55. The rear endof the link 52, which the link I engages when the spring MI is hookedthereto, serves as a stop for the link I55.

The operation of the latch mechanism is substantially as follows:

When in normal operation, the hook I45 is engaged with the latch I andholds the same away from the pin on the crank axle arm H. In thisposition of the latch I55, the arm 4I may swing back and forth withoutinterference when the crank axles 55 and 54 are raised and lowered. whenthe operator finishes plowing the field and desires to move the outfitto another place, he disengages the hook I43 from the latch arm I55while the plow is still in its lowered or operating position. The actionof gravity theii causes the latch I35 to ride on the pin 45. Then whenthe plow is raised into its transport position the arm 4! swingsforwardly as the crank axle 55 is moved downwardly, and as the end ofthe pin 45 moves forwardly with the arm H, the notch I51 in the latchlever I35 drops down over the end of the pin 45 and so prevents the armH from swinging rearwardly, as shown in Figure 5. The power unit 4 onthe tractor may now be actuated in the lowering direction to relieve theconnections but the tools will be held in their raised position sincethe latch I35 now engages the pin 45 on the arm 4I and prevents theclockwise movement of the crank axles (Figure 2). This takes the strainoff the lifting torque shaft and associated universal joints and otherconnections, and as a matter of fact: the tractor may, if desired, beentirely disconnected from the implement while the latter will be heldin its raised position by virtue of the engagement of the latch with thearm I39. When the farmer reaches the next field to be plowed, assuminghe has merely relaxed the torque shaft lifting connections and left theplow hitched to the tractor, before starting to lower the plow into itsoperating position, the farmer will first reengage the hook I45 with thelatch I55. The spring I thus tends to swing the latch I35 away from thepin 45, but since the latter is sustaining the weight of the tools andframe, the spring is for the moment ineffective. After reengagingthe,spring I with the latch I35, the farmer then actuates the power unit4 on the tractor in the lifting direction, thus relieving the pressurebetween the latch I55 and the pin 45, whereupon the spring moves thelatch I35 into an inoperative position. Then the farmer actuates theunit 4 on the tractor in a lowering direction and thus sets theimplement for operation. To this end, it is desirable that the powerunit on the tractor has a somewhat greater range of movement at bothextremes than the raising and lowering mechanism on the implement.

A modified form of the present invention is shown in Figures 6 and 7.While the preferred form of the present invention is shown as embodiedin a tractor propelled plowing implement, shown in Figures 1-5, it is tobe understood that the present invention, particularly as regard thearrangement of the parts so that one of the universal joint axes is in avertical position when the implement is raised, coinciding generallywith the axis of pivotal movement in a horizontal direction between theimplement and the tractor. is not to be limited to plows. In Figures 6and I t I have shown, more or less fragmentarily, an

implement I55 which includes the forward hitch connection I5I pivoted tothe drawbar I5a of the tractor for generally horizontal swingingmovement about a pivot axis defined by the pivot connection I52. In thisimplement I have shown a power connection including a power take-offshaft I55 extending rearwardly from the tractor, a universal joint I55connecting the power takeoff shaft I55 with a power drive shaft I51, thelatter being connected by asecond universal joint I55 with a drive shaftI 59 that extends to some operating part on the implement I55. Since forbest operation it is desirable to have the universal joints I55 and I55disposed adjacent the longitudlnal vertical plane of the hitch pivotI52, it becomes desirable to mount the lifting torque shaft to one sideof the pivot point I52 instead of over the same, as shown in Figures1-5. The torque shaft mechanism for raising or lowering, or otherwiseshifting, a part on the implement I5II is indicated by the referencenumeral I50 and includes a pair of telescopic shaft sections I51 and I65connected by a universal joint I59 to a short rock shaft "I that ismounted for both rocking and sliding movement in a bearing I12 fixed bya bracket I13 to the drawbar or some other fixed part on the tractor.The longitudinal position of the short rock shaft Hi In its bearing I12is controlled by a link I15, the forward end of which is connected by acollar I15 with the shaft "I and the rear end of which is pivoted, as atI15, to an arm I15 disposed at one side of but adjacent the pivot I52.The arm I15 is secured to the hitch I5I of the implement. The rear endof the rear telescopic shaft section I65 is connected by a universalJoint I5I to a short rock shaft I52 that is supported by a bracketbearing I 54 on the implement I50. The shaft I52 is connected to thepart on the implement I55 by any suitable means, such as an arm I55, abell crank I55 mounted on or connected with the forward portion of theimplement I55, a link I51 connecting the arm I55 and the bell crank I55,and a link I55 extending rearwardly from the upper arm I59 of the bellcrank I56 back to the implement part to be controlled. The forward rockshaft I1I carries an arm I55 which is connected to be operated by thelink I 53 (Figures 1 and 2) and associated parts on the tractorcontrolled by the power unit 4, as described above.

Figure 6 shows the parts in the normal operating straight aheadposition, the power drive shaft I55, I 51, I55 extending generallylongitudinally, with the lifting shaft I1I, I51, I58, I52 also inlongitudinal position alongside the power drive. shaft. The implementand tractor may pivot one with respect to the other in a generallyhorizontal direction within limits and such pivoting will beaccommodated by the universals I55, I55, and I55, IN, the consequentchanges in the length of the torque shaft lifting connection beingaccommodated by a sliding movement of the rock shaft I" in its bearingI12, under the control of the link I15. As in the modification describedabove, the crank shaft lifting connections are such that when theimplement part is in its raised or transport position, one of the yokesof the forward universal joint I69 is disposed with its axis generallyvertical. Being in this position, the lifting shaft connections Ill andI61, I65 may swing horizontally without interference.

' ment about a ment. The resulting rearward movement or the arm Illpulls the rock shai't I'll rearwardly relative to its bearing I'll sothat the universal Joint I" is adjacent the pivot Ill but out of the wayof the power drive shaft sections I", I". when the tractor is turned inthe other direction, that is, to the right, as shown in dotted lines '7,the link I15 causes the rock shaft moved forwardly in its bearing I12,thus keeping the universal joint I89 close to the pivot I52 butadjusting the position thereof so that it clears the power shaftconnections.

While we have shown and described above the preferred structure in whichthe principles of the been incorporated, it is to invention is not to belimited to the particular details shown and described above, but that,in tact, widely different means may be employed in the practice of thebroader aspects 01 our invention.

What we claim, therefore, and desire to secure by Letters Patent is:

1. In combination, a tractor having a power unit including a membermovable about a generally longitudinal axis, an implement having a partadapted to be raised and lowered into and out of transport position anda member operatively connected with said part and swingable about agenerally longitudinal axis for shitting said part, means connectingsaid implement with the tractor for generally lateral swingingmovegenerally vertical axis relative thereto, shai't means members andincluding a universal Joint spaced generally vertically from the meansconnecting the implement with the tractor, said universal joint and saidmembers being arranged so that when said implement part is in its raisedposition one of the axes of said universal joint substantially coincideswith said first vertical axis, whereby when the implement is in itsraised position said lateral swinging movement or the implement relativeto the tractor through relatively wide angles is accommodated.

2. In combination, a tractor having a source or power, an implementhaving a part adapted to be raised and lowered, detachable hitch meansconnecting said implement with the tractor, de-

tachable operating connections between said source of power and saidimplement part whereby. when said implement is attached to the tractor,said part may be raised and lowered by energy derived from the tractorsource of power, and means on the implement separate from said operatingconnections for holding said part in a given position when said hitchmeans and said detachable connections are detached.

3. An implement adapted to be attached to a tractor having a poweroperated member thereon, said implement comprising a part to be movedfrom one position to the other, power actuated connections extendingbetween said part and said member on the tractor, said power operatedconnections being releasable to provide for detaching the implement fromthe tractor, and latch means on the implement optionally biased toengage said part for locking the same in raised position when theimplement is detached from the tractor and to remain out of engagingposition when the implement is connected withthe tractor.

operatixgely connecting said 4. An" agricultural implement includingmeans serving as a frame, a movable part arranged to assaiss 5 -1"igure7 shows the parts where the tractor has support at least a portion oi.the weight oi said swung widely to the left relative to the implerrameand movable relative thereto between raised and lowered positions, latchmeans movable into and out oi engagement with said part, spring meansconnectible with and detachable from said latch means, said latch meansbeing movable into engagement with said part when the latter is movedinto a raised position and the spring means is disconnected from thelatch means, whereby the latter acts against said part to preventmovement thereof into lowered position, and means separate from-saidlatch and part for moving the latter implement relative to the tractorror ad usting the eflective length of said extensible means.

6. In combination, a tractor having a power means accommodating saidrelative ment, disposed substantiallly in lateral movethe generallyvertical longitudinal plane of said hitch means, extensible torquetransmitting means extending from said swingable power operating memberto said swingable implement member and disposed to one side of the planeof said power shaft means, and means responsive to the lateral swingingmovement of the implement relative to the tractor for adjusting saidextensible means to accommodate the lateral swinging of the poweroperating member on the tractor relative to the swingable implementmember.

8. In combination, a tractor having a power unit including a membermovable about a generally longitudinal axis and means for locking saidmember in one position, an implement having a part adapted to be raisedand lowered into and out of transport position and a member operativelyconnected with said part and swingable about a generally longitudinalaxis for shifting said part, means connecting said implement with thetractor for generally lateral swinging movement about a generallyvertical axis relative thereto, shaft means operatively connecting saidmembers and including a 7 generally vertically from e means connectingthe implement with the tractor, said locking means acting through saidtractor power operated member, said shaft means and said implementmember for holding said implement part in one position, said universaljoint and said members being arranged so that when said implement partis in said one position one of the axes of said universal jointsubstantially coincides with said first axis, whereby when the implementis -in its raised position said lateral swinging movement of theimplement relative to the tractor through relatively wide angles isaccommodated.

9. In combination, a tractor having a power unit including a membermovable about a generally longitudinal axis and means for locking saidmember in one position, an implement having a part adapted to be raisedand lowered into and versal joint spaced out of transport position and amember operatively connected with said part and swingable about agenerally longitudinal axis for shifting said part, means connectingsaid implement with the tractor for generally lateral swinging movementabout a generally vertical axis relative thereto, shaft meansoperatively connecting said members and including a universal jointspaced generally vertically from the means connecting the implement withthe tractor, said locking means acting through said tractor poweroperated member, said shaft means and said implement member for holdingsaid implement part in one position, said universal joint and said rmembers being arranged so that when said implement part is in said oneposition one of the axes of said universal joint is substantiallyvertical and lies adjacent said first vertical axis whereby theimplement is free to swing laterally relative to the tractor.

10. In combination, a tractor having a power unit including a memberswingable through approximately ninety degrees of revolution, animplement connected with the tractor and including a part to be movedfrom one position to another and a member connected therewith for movingsaid part and also swingable about an axis through a part of arevolution, said members being swingable about generally longitudinalaxes, a torque shaft operatively connecting said members, and universaljoint means connecting said implement member with the member on thetractor, said universal joint means including a universal Joint adjacentthe tractor having parts connected together for movement about an axisthat is substantially vertical when said tractor member is rocked tomove said implement part into one position, whereby said implement isfree to swing laterally relative to the tractor without causing rotationof said torque shaft when the implement shifts laterally.

THEOPHILUS BROWN. FRANK T. COURT.

